Compilare: main.cpp: In function 'bool Pot1()': main.cpp:18:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); ++i) if (x[i] == '1') return true; ~~^~~~~~~~~~ main.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size() - 1; ++i) if (x[i] == '1') return true; ~~^~~~~~~~~~~~~~ main.cpp: In function 'bool Pot2()': main.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); ++i) if (x[i] == '0') return true; ~~^~~~~~~~~~ main.cpp: In function 'void rezolva_2()': main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); ++i) ~~^~~~~~~~~~ main.cpp:77:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p != x.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:82:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = p + 2; i < x.size(); ++i) x1[i] = '1'; ~~^~~~~~~~~~ main.cpp:86:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = p + 1; i < x.size(); ++i) x1[i] = '1'; ~~^~~~~~~~~~ main.cpp:115:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos1 != x.size() - 1) ~~~~~^~~~~~~~~~~~~~~ main.cpp:130:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pos0 + 1; i < x.size(); ++i) x2[i] = '0'; ~~^~~~~~~~~~ main.cpp:132:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pos0 + 1; i < x.size() - 1; ++i) x2[i] = '0', x2[x.size() - 1] = '1'; ~~^~~~~~~~~~~~~~